﻿#region Copyright (C) 2011 by Pavel Savara

/*
This file is part of polyglottos library - code generator tool
http://code.google.com/p/polyglottos/

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#endregion

using System;

namespace polyglottos.snippets
{
    /// <summary>
    /// Allows only single item in the container, forming chain
    /// </summary>
    public class GChainSnippetBase : GContainerSnippetBase
    {
        public override void _AddSnippet(IGSnippet snippet)
        {
            if (snippets.Count == 0)
            {
                snippets.Add(snippet);
            }
            else
            {
                snippets[0] = snippet;
            }
        }

        public override void _InsertSnippet(int index, IGSnippet snippet)
        {
            if (snippets.Count == 0)
            {
                snippets.Add(snippet);
            }
            else
            {
                snippets[0] = snippet;
            }
        }

        public override void _RemoveSnippet(IGSnippet snippet)
        {
            if (snippets.Count == 0)
            {
                throw new InvalidOperationException();
            }
            snippets.Clear();
        }
    }
}
